I have a dle55 which was 2db over in my usual club. It has a canister on it as well. I was advised to change this and that. Not willing to change anything as the motor runs so well it now only flies at another club with a much greater noise limit.

You could give JE and Weston a ring , they both make modified exhausts....may be not cheap and no guarantee that it would get you under. I’ve also read about people putting a stainless steel scouring pad into the exhaust chamber in an effort to cut down on the sound pressure wave ringing the housing like a bell

Personally I’ve found that pepper pots make very little difference in noise levels, as Denis has posted, volume is your friend. I run all of my DLEs on cans, the DLE ones are ok but Zims and JMBs are more expensive, for a very good reason. As an example, the DLE can for the 35 is 50mm diam, the equivalent Zim is 60mm.

1. you could try a the peper pots they do make a difference also the prop can make a difference if you can fit a bigger prop at slower rpm to do the same job.( some makes are quiter)

2. check the airframe/cowl is not vibrating to much and generating some noise , cheep well nuts or similar can help.

3. whats very much overlooked is the noise from the carb intake on a 2t can emmit a lot of noise, try a veturi and filter material over the intake not as a air filter as such but to muffle the noise

4. all the little improvements can ad up.

5. make the pits mufferler out of copper instead of stainless (it will make a lot softer noise) in doing so increace the diameter of the pipe that comes off the manifold part by as much as that will fit and install baffle material some thing like this will for an idea saves fabricating to much

Well that thread started off fine but very soon deteriorated into a fight

What fight? Those of us who have been through getting the noise of two stroke petrols down to acceptable levels are saying that you need to be looking a fitting a can. You may also need to look at prop tip speed and airframe resonance.

The shock wave coming from the combustion hits the exhaust body and it rings like a bell as it travels around the empty metal tube. The more it has to bend the more the energy is disappearing so quieter the end result. If you can find a second hand one, do some modifications. Baffling, adding internal pipes, that sort of thing.

As Denis said, know a welder who can do Ali...it could be cheaper than buying a muffler that doesn’t work

No im not buying a new one, i had a DLE55 in my 1/3 Bucker, and it was spot on, this was last year when i lived in Cyprus, i sold or gave away everything when i came back to the uk including the DLE, this silencer is a new one i had just bought, looks like ill give up on it as i have to buy a new engine anyway, but i did like the DLE, and i flat packed the Bucker and brought the bits back, need an engine for it,when i rebuild it